Conestoga Diesel Injection


1321 Byerland church Rd.

Willow Street PA, 17584-9776

Hours: Monday through Friday 8:00AM to 5:00PM

Phone 717-806-5561  FAX 717-806-5572

Timing Injection Pumps

Correct timing of the injection pump to the engine is key to maximizing performance and fuel economy.  Always consult your engine manual for proper instructions.  Below we will document answers to popular questions we receive that may be helpful.  We do not guarantee this information to be representative of manufacturers instructions, so use of this information is at your discretion always.

Ford or International 6.9 and 7.3 IDI engines

As with many IDI engines, accurate timing goes a long way to really getting the most out of these old engines.  We utilize and recommend only the pulse timing method, recommended in Ford literature after 1987.

With the engine at operating temperature, set the injection timing using a pulse detecting meter such as the Snap-On MT1480, with the magnetic probe in the tall 5/16" diameter probe receptacle on the crankshaft damper plate, and the pulse detector on the #1 or #4 injection line.  The timing specification is 8.5 to 9.5 degrees before top dead center, using a 20 degree offset on the meter at 2000 RPM.

If an MT1480 is not available, timing may be accomplished using a timing light and a pulse converter.  CDI has a rental program to provide such equipment for your use.  Call to inquire.

General Motors 6.2 and 6.5 IDI engines

To the best of our knowledge, GM never provided a pulse method specification.  We are not fans of luminosity timing, because it relies heavily on the spray pattern of the #1 injector, the quality of the optical glass, and the cetane value of the fuel must be known, which is very difficult given the variety of fuels out there.  Consequently, we have developed our own pulse specification.  Forgive us... it's a bit fudge, and based off off our experience with timing Fords.  We always set our GM Moose products up with this, and have had lots of happy customers as a result.  We use a Snap-On MT-1480 for this, and those are not readily available, but hopefully this guidance will allow a smarter person to convert this to something they can work with.  The specification is  -7.5 degrees off of #1 cylinder @1600 RPM using a 20 degree offset.  Again, that is a MINUS 7.5 degrees.  We're sure it has to do with the 20 degree offset, but since we don't know the actual offset of the probe hole, this is what we go with.  The probe hole is down on the right side front of the engine, often behind a belt driven accessory which makes it hard to see.